I have a four and half year old Dell XPS M1330 notebk with 4GB ram and a 2.6ghz core2 duo processor. I suspect it came with the 1.5gb SATA hardware. Could it run a 6gb SATA ssd? If so, would that be at full speed, or am I better off with a 3gb SATA?
You will be best off with the SSD that you can get for the least $/GB. Look for SATA 2 drives that have good rebates or are close to being discontinued. For my older machines, I've been picking up SSDs for them when I can get them at/under $1/GB.